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Restructuring - Recorded Restructuring Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]      
Total $ 13 $ 4 $ 3
Cost of Sales [Member]      
Restructuring Cost and Reserve [Line Items]      
Total 12 $ 4 1
Selling and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Total $ 1   $ 2